transom tunnel troubles

[texas nitro]

can anyone help??
2005 nitro bay boat transom tunnel 8 inch taking on water between transome and engine bracket and will not plane properly

[marshmat]

Taking on water between transom and bracket? You may have some deteriorating seals; then again, your bracket could be cracking your transom laminate. Bracket will ahve to come off and transom needs a full inspection.

Not planing? Could be because of the water sloshing around the bilge; also, if your bracket or transom has taken damage your motor will no longer be at the right height or trim, and could be flexing the hull when gunned.

You'll probably have to pull the engine and bracket and thoroughly measure and check everything to get a better diagnosis.

[texas nitro]

Thanks, But this is a brand new boat, It Has been doing this since i got it.
I have taken it back to the dealer 4 times, they 1st changed motor said it had a pontoon motor with big foot lower end.
installed the correct mercury 60 hp 4 stroke, 2nd trip raised engine 1 hole and took out trim pin, 3 rd tip raised engine 1 hole, 4th trip same.
let me see if i can explain, the water is riding up the back of the boat in between the engine bracket and transome then coming into the boat at the top of the engine bracket where it makes it hook to the inside of the boat.

I was Wondering if the engine was running too deep causing the bottom of the bracket to dig in?
Is There anyway too visually tell where the motor should sat trimed all the way down in conjunction to the botom of the boat?

The Plaining Problem Accualy got worse when i installed a tiger shark hydrofoil, it takes about 15 seconds to plain, and even that has to be worked.

would a jackplate help?

[marshmat]

Trimmed level, the motor's antiventilation plate should be between level and 1" below the keel on most boats; try to get the motor height about here.

Some photos of your installation would really help with the water issue. This is a very dangerous condition if you're getting substantial amounts of water coming in. From your description it's hard to tell if you're talking about a motor that's mounted on an external bracket, or a motor with an integral bracket that's mounted on the transom. Is the water coming over the top of the transom? As for the planing problem: does it plough? is there excessive bowrise? does it stuff the bow down too soon?

I'd avoid spending money on new gadgets (jackplate etc) until you have the problem fixed.

[texas nitro]

It is a motor with an integral bracket that's mounted on the transom.
And yes it is coming over top of transomwhen coming off plane.
It originally came in will trying to get on plane around 3000 rpms and come in alot,like someone stuck a hose pipe between the transome and motor shooting straight up, now it only comes in while coming of plane for about 4 second.

planing, it plows through water trimed all the way down and will not pick up enough speed to get on top, you have to tim up while planing up or you stay plowing water all the way down at around 4000 rpms WOT

[Corpus Skipper]

it plows through water trimed all the way down and will not pick up enough speed to get on top

You should only have the engine trimmed all the way down to get out of the hole, and trim up while coming on plane. This is how it's supposed to work. Trimming up will get the bow out of the water, give you a better ride, and more speed. Trim up untill she starts to porpoise or ventilate, then trim down just a little and you'll be in the "sweet spot".

you have to tim up while planing up or you stay plowing water all the way down at around 4000 rpms WOT

You should pick up RPM as you trim up, but it sounds like you're over propped, you should get 5500 RPM or more, check your owner's manual.

[marshmat]

Water coming over the transom is often an issue with low-profile boats, especially if they aren't trimmed right. Sounds to me like you really should have a motor well, but apparently don't... Try Craig's advice about trim settings; this should get it working. If not, your rig is probably set up totally wrong (wrong height, wrong prop) and should be adjusted professionally according to the designer's drawings.

Tunnels of any sort, especially single-engine ones, are very sensitive to trim, height and load conditions.

[marshmat]

This same question is being discussed in two threads. Further discussion should be in 2005 nitro bay boat is this a design flaw? for the sake of clarity.

Please don't submit the same question in multiple threads.